EP0794624A2 - Dispositif pour la commande des éléments d'une machine, en particulier d'une machine-outil - Google Patents

Dispositif pour la commande des éléments d'une machine, en particulier d'une machine-outil Download PDF

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Publication number
EP0794624A2
EP0794624A2 EP97103167A EP97103167A EP0794624A2 EP 0794624 A2 EP0794624 A2 EP 0794624A2 EP 97103167 A EP97103167 A EP 97103167A EP 97103167 A EP97103167 A EP 97103167A EP 0794624 A2 EP0794624 A2 EP 0794624A2
Authority
EP
European Patent Office
Prior art keywords
bus
controller
data
elements
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97103167A
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German (de)
English (en)
Other versions
EP0794624A3 (fr
Inventor
Gesellschaft Mit Beschraenkter Haftung Murr-Elektronik
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murrelektronik GmbH
Original Assignee
Gebrueder Heller Maschinenfabrik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gebrueder Heller Maschinenfabrik GmbH filed Critical Gebrueder Heller Maschinenfabrik GmbH
Publication of EP0794624A2 publication Critical patent/EP0794624A2/fr
Publication of EP0794624A3 publication Critical patent/EP0794624A3/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0421—Multiprocessor system
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25032—CAN, canbus, controller area network bus
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25035—Star network

Definitions

  • the invention relates to a device for controlling elements of a machine, preferably a machine tool, according to the preamble of claim 1.
  • a serial data bus system in the form of the CAN system is provided for this.
  • this bus system has a passive star coupler 31, to which 32 subscribers 1 to n are connected via optical fibers.
  • the CAN system is characterized by the fact that each participant can communicate with everyone else. Relatively high losses occur in the star coupler 31, which are in the order of magnitude of approximately 11 to 14 dB.
  • FIG. 7 shows the dependence of the absolute light output or the relative power loss on the length of the light guide 32.
  • the absolute light output decreases within the star coupler 8 due to scattering and coupling losses. Additional losses occur within the light guide 31 due to the fiber attenuation. For this reason, the transmission lengths are for the data to be transmitted limited to about 5 m, for example. As FIG. 7 shows by way of example, the coupling loss and the connector attenuation are each 1 dB.
  • the fiber attenuation of the light guide 32 is typically on the order of 200 dB / km. For this reason, in order to ensure secure data transmission, the transmission length in the exemplary embodiment shown is limited to 5 m.
  • the coupling losses in the star coupler 38 are very high and, as FIG. 7 shows by way of example, is 12 dB.
  • the invention has for its object to design the generic device so that long transmission distances with secure data transmission are possible with the CAN bus.
  • the elements to be controlled are each connected to the star node via two optical transmission links, which in turn is connected to the controller.
  • the data to be transmitted are amplified by the amplifier before their entry into the respective element in such a way that the light power attenuation acting on the transmission path is at least partially canceled.
  • the desired light output is available at the input of the elements to be controlled.
  • the transmission paths for the data can be very large due to the inventive design, for example, 60 m and more.
  • Fig. 1 shows a schematic representation of a machine 1, which can be a machining or a processing machine. It has a machine control 2 with which different aggregates and elements can be controlled.
  • peripheral devices 3 to be controlled are given as examples, which can be hydraulic valves, pumps, motors, lights, limit switches, proximity switches, position sensors, interlocks and the like.
  • a terminal 4 with at least one display 5 and control elements 6 is also provided on the machine 1.
  • the peripheral devices 3 are each connected via two light guides 7 to a star point 8, to which the machine control 2 is also connected.
  • the various peripheral devices 3 are networked with one another by means of a serial data bus CAN (Controller Area Network).
  • the star point 8 is connected to the controller 2 via such a CAN bus 9 '.
  • the peripheral devices 3 can communicate with one another in a manner to be described via the CAN bus.
  • FIG. 2 shows the basic structure of a star structure using the star point 8.
  • the light guides 7 are connected to it, which connect the star point 8 to the respective peripheral devices 3.
  • the optical separation between the respective peripheral device 3 and the star point 8 takes place through the light guide 7.
  • peripheral devices 3 instead of the peripheral devices 3, further star nodes can be provided, from which in turn several light guides lead to further star nodes and / or peripheral devices.
  • Each peripheral device 3 or each star node has a CAN controller 10 (FIG. 3), the output of which is via an adaptation element 11, preferably a CMOS gate an E / O converter 12 is connected, which converts the electrical signals coming from the CAN controller into optical signals.
  • One end of the light guide 7 is connected to the E / O converter with a plug 13, the other end of which is connected to an O / E converter 15 via a plug 14. It converts the optical signals back into electrical signals.
  • E / O or O / E converters are known.
  • the O / E converter 15 is connected to a bus coupler 17, which is connected to the CAN bus 9.
  • This CAN bus 9 provided in the star point 8 can be regarded as a virtual CAN bus, since it is not designed as a line, but rather as a short conductor track on a board (not shown).
  • the CAN controller 10 also has an input which is connected to the bus coupler 17.
  • the signals coming from the CAN bus 9 and from the bus coupler 17 are fed via an adaptation element 18, preferably a CMOS gate, to an E / O converter 19, which converts the electrical into optical signals.
  • One end of the light guide 7 is connected to this converter via a plug 20, the other end of which is connected to an O / E converter 22 via a plug 21. It converts the optical signals back into electrical signals which are fed to the corresponding input of the CAN controller via an adaptation element 23, preferably a CMOS gate.
  • the content of a message is identified by a network-wide unique identifier.
  • the identifier also determines the priority of the message to be sent. This is critical for bus allocation when multiple peripherals compete for bus 9.
  • the CPU transfers to controller 2 the data to be transferred and their identifier with a transfer request to the assigned CAN module of controller 2.
  • This CAN module takes over, which is not shown in the drawings, but is known per se.
  • all peripheral devices 3 will receive this message. With an acceptance check, all peripheral devices in the network determine whether the received data is relevant to them or not after the message has been correctly received using the identifier that was sent. If the data are of importance for the respective peripheral device 3, they are processed further, otherwise ignored.
  • the priority with which data is transmitted before other, less important data is determined by the identifier of the data to be transmitted.
  • the priorities are assigned using appropriate binary words. For example, of two different binary words, the one with the higher priority, the value, considered as a binary number, for example lower. Then only this data is received by the respective peripheral device 3.
  • the bus is allocated using bitwise arbitration via the respective identifier.
  • This arbitration is known in the CAN data bus system and is therefore only briefly explained.
  • Each peripheral device 3 and also the controller 2 observe the respective bus level bit by bit, which can be recessive or dominant. The dominant state, which corresponds to logic 0, overwrites the recessive state, which corresponds to logic 1. For this reason, all those peripheral devices 3 or the controller 2 lose the competition for the bus allocation which transmit recessively but watch dominantly on the respective bus. These peripheral devices or the controller 2 lose their arbitration and become receivers.
  • peripheral device 3 or the controller 2 asserts itself and receives or receives bus access and can send data that transmits dominantly and is recessively observed on the bus. All other peripheral devices 3 are then automatically recipients of this data and only attempt to send their data again when the bus is free.
  • the star point 8 or star coupler has a microprocessor 24 which is connected to a CAN controller 25.
  • a RAM memory 26 and an EPROM 27, preferably a flash EPROM, are connected to the microprocessor 24.
  • the EPROM 27 contains the basic program as well as any assignments and commands.
  • the RAM memory 27 forms the main memory of the star coupler 8.
  • the microprocessor 24 is also connected to an E / O control port 28, to which the ON / OFF switch designated as EN_Port 1 to 8 for the E / O converter 12 are connected.
  • the light guides 7 are connected to these converters, as has been explained with reference to FIG. 3.
  • the converters 12 are each connected to the internal CAN bus 9 of the star coupler 8 via an interface module 29.
  • the CAN controller 25 is also connected to the internal CAN bus 9 via the interface module 29.
  • the extended CAN bus 9 '(FIG. 1) can be connected to the CAN bus 9 via an interface 30.
  • the CAN controller 25 receives a star node ID, so that a corresponding star node is assigned to it.
  • an assignment table is loaded into the star coupler 8 via the internal CAN bus 9 and the CAN controller 25, by means of which the optical star coupler 8 can determine a corresponding assignment to the peripheral devices 3 to be controlled.
  • the various E / O converters 12 are addressed via the internal CAN bus 9 and can also be switched on and off to the required extent by means of the E / O control port 28.
  • An external CAN bus which is formed by the extended CAN bus 9 ′, the internal CAN bus 9 and the optical CAN bus, which is formed by the different light guides 7, can be distinguished in the control.
  • the adaptation elements 18, 23 are provided, which serve as amplifiers. As can be seen from FIG. 5, the light output decreases with increasing transmission path. A considerable decrease in the light output takes place in particular within the light guide 7.
  • the amplifiers 18, 23 of the active star coupler 8 ensure that the light output is raised to the desired level after a long transmission path. This level can be, for example, the starting level or a higher level. This ensures that the data reach the respective receivers, the peripheral devices 3, without errors. So that the data to be transmitted are not weakened too far at the time of amplification, a so-called safety distance from a maximum negative absolute light output is provided, which can be, for example, 3 dB. This ensures that the data have no errors at the time of amplification.
  • the controller 2 itself can also receive corresponding data via the CAN bus described, for example in the form of feedback from peripheral devices 3. If, for example, a peripheral device 3 is a rotatably driven work spindle of a machine tool, the work spindle can, for example, send data about its speed, the working temperature or the like back to the controller 2 via the CAN bus, in which this data is evaluated and possibly for a readjustment of the corresponding one Peripheral device can be used.
  • the light guides 7 typically have a fiber attenuation of approximately 200 dB / km. This high fiber attenuation would have a detrimental effect on the data transmission without the configuration of the CAN bus described. In particular, large transmission links could not be used. Due to the amplifier elements 18, 23, the star coupler 8 becomes an active element with which the light power and thus the transmission power is optimally amplified, so that reliable data transmission is ensured even over long transmission distances.
  • the light guides 7 can be glass fiber cables or POF (Plastic Optical Fiber) cables. However, it is also possible to use an optical directional link, preferably a laser, as the optical transmission link 7.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)
EP97103167A 1996-03-05 1997-02-26 Dispositif pour la commande des éléments d'une machine, en particulier d'une machine-outil Withdrawn EP0794624A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996108335 DE19608335A1 (de) 1996-03-05 1996-03-05 Vorrichtung zur Ansteuerung von Elementen einer Maschine, vorzugsweise einer Bearbeitungsmaschine
DE19608335 1996-03-05

Publications (2)

Publication Number Publication Date
EP0794624A2 true EP0794624A2 (fr) 1997-09-10
EP0794624A3 EP0794624A3 (fr) 2004-05-12

Family

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Family Applications (1)

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EP97103167A Withdrawn EP0794624A3 (fr) 1996-03-05 1997-02-26 Dispositif pour la commande des éléments d'une machine, en particulier d'une machine-outil

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EP (1) EP0794624A3 (fr)
DE (1) DE19608335A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001003489A1 (fr) * 1999-07-06 2001-01-11 Siemens Aktiengesellschaft Procede et dispositif pour transfert de donnees entre un automate d'equipement et une unite d'amenee, automate d'equipement et unite d'amenee y relatifs
EP1122218A2 (fr) * 2000-01-31 2001-08-08 Owens-Brockway Glass Container Inc. Système de fabrication d' objets en verre avec configuration de communication en étoile
WO2005081077A2 (fr) * 2004-02-20 2005-09-01 Fmc Kongsberg Subsea As Systeme de commande sous-marin
EP1482676A3 (fr) * 2003-05-28 2006-05-10 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Système d'un CAN-bus
EP1801967A2 (fr) * 2005-12-22 2007-06-27 Robert Bosch Gmbh Point étoile actif pour installation dans un système de communication doté d'une topologie en étoile
EP2530536A1 (fr) * 2011-05-30 2012-12-05 Siemens Aktiengesellschaft Prise avec un convertisseur de signal optique - electrique
CN103279087A (zh) * 2013-05-07 2013-09-04 杭州电子科技大学 全自动包片机控制系统及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19935512A1 (de) * 1999-07-28 2001-02-08 Siemens Ag Vorrichtung zur Verbindung einer industriellen Steuereinheit mit einem industriellen Bedienpanel

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
BOYCE C R: "A four station controller area network" IEE COLLOQUIUM ON 'VEHICLE NETWORKS FOR MULTIPLEXING AND DATA COMMUNICATION' (DIGEST NO.138), LONDON, UK, 19 DEC. 1988, Seiten 9/1-7, XP002273965 1988, London, UK, IEE, UK *
VANDE KEERE V ET AL: "Embedded real-time intelligence in the physical layer of telecommunication networks" PROCEEDINGS OF THE IEEE WORKSHOP ON REAL-TIME APPLICATIONS (CAT.NO.93TH0559-5), NEW YORK, NY, USA, 13-14 MAY 1993, Seiten 34-38, XP002273966 1993, Los Almitos, CA, USA, IEEE Comput. Soc. Press, USA ISBN: 0-8186-4130-4 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001003489A1 (fr) * 1999-07-06 2001-01-11 Siemens Aktiengesellschaft Procede et dispositif pour transfert de donnees entre un automate d'equipement et une unite d'amenee, automate d'equipement et unite d'amenee y relatifs
EP1122218A2 (fr) * 2000-01-31 2001-08-08 Owens-Brockway Glass Container Inc. Système de fabrication d' objets en verre avec configuration de communication en étoile
EP1122218A3 (fr) * 2000-01-31 2005-11-02 Owens-Brockway Glass Container Inc. Système de fabrication d' objets en verre avec configuration de communication en étoile
EP1482676A3 (fr) * 2003-05-28 2006-05-10 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Système d'un CAN-bus
WO2005081077A2 (fr) * 2004-02-20 2005-09-01 Fmc Kongsberg Subsea As Systeme de commande sous-marin
WO2005081077A3 (fr) * 2004-02-20 2006-02-02 Fmc Kongsberg Subsea As Systeme de commande sous-marin
US8806092B2 (en) 2004-02-20 2014-08-12 Fmc Kongsberg Subsea As Control system for a subsea installation
EP1801967A2 (fr) * 2005-12-22 2007-06-27 Robert Bosch Gmbh Point étoile actif pour installation dans un système de communication doté d'une topologie en étoile
EP1801967A3 (fr) * 2005-12-22 2012-07-04 Robert Bosch Gmbh Point étoile actif pour installation dans un système de communication doté d'une topologie en étoile
EP2530536A1 (fr) * 2011-05-30 2012-12-05 Siemens Aktiengesellschaft Prise avec un convertisseur de signal optique - electrique
CN103279087A (zh) * 2013-05-07 2013-09-04 杭州电子科技大学 全自动包片机控制系统及方法
CN103279087B (zh) * 2013-05-07 2015-08-12 杭州电子科技大学 全自动包片机控制系统及方法

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DE19608335A1 (de) 1997-09-11
EP0794624A3 (fr) 2004-05-12

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